In this paper a quasi maximum likelihood method for estimating a low order model of a flexible vehicle has been developed and demonstrated. The quasi maximum likelihood method uses a large number of sensors to estimate the parameters and covariance in a method consistent with the maximum likelihood filter-error method. The cost function has been defined in a frequency domain to improve computational efficiency and to enable estimation of an unstable plant. The method has been demonstrated using flight data from the National Aeronautics and Space Administration X-56A Multi-Utility Technology Testbed flex wing tests, which include unstable flutter modes. The method was able to effectively estimate the frequency and damping of the dynamics of the aircraft and generate a transfer function that is useful for control system evaluations.


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    Title :

    Frequency Domain Quasi Maximum Likelihood Identification of Low Order Aeroservoelastic Models from Flight-Test Data


    Contributors:

    Conference:

    SciTech 2023 ; 2023 ; National Harbor, MD, US


    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English






    IDF Flight Aeroservoelastic Test

    Chang, Y. B. / Sun, L. T. / Lin, T. Y. | British Library Conference Proceedings | 1993